Ti-mn-fe alloys



Fatented Dec. 29, 1953 UNITED STATES PATENT orrier.

Ti-Mn-Fe ALLOYS Charles M. Oraighead, Columbus, Ohio, assignor, by mesne assignments, to The Battelle Devel- Columbus, Ohio, a coropment Corporation, poration of Delaware No Drawing. Application October 6, 1950, Serial No. 188,892

2 Claims.

that certain titanium-base alloys possess good strength and hardness properties together with sufiicient ductility to render them useful and advantageous for numerous and varied uses.

It is, therefore, an object of this invention to provide new and useful titanium-base alloys.

It is a further object of this invention to provide titanium-base alloys having good mechanical properties.

Yet another object of this invention is to provide new titanium-base alloys containing manganese and iron.

Other objects and advantages 01 this invenvention will be apparent in view of the following detailed description thereof.

In general, this invention relates to titaniumbase alloys containing from about 1.0% to 5.0% manganese and from about 1.0% to about 2.0% iron.

Properties of alloys of the present invention have been determined and are reported in Table properties listed in Table I were measured using specimens prepared irom alloys in the as-hot-rolled (at 1450" F.) condition. Properties of specimens similarly prepared from the unalloyed titanium are included for purposes of comparison.

TABLE I Mechanical properties of Ti-Mn-Fe alloys M Composition 1 Tensile Elongastrength, gg g V. H. N. Mn Fe l-lnch Balance titanium. I Unalloyed.

It has also been observed and determined that the alloys of the present invention respond to heat treatment. This has been demonstrated by observing increases in hardness which occur when the alloys are heated in air for one=half hour at temperatures at or above the rolling temperature (1450 F.) followed by a quenching in cold water. Table II below tabulates these values illustrating how the present alloys do respond to this heat treatment.

TABLE II Heat treating data for Ti-Mn-Fe alloys Composition Vickcrs hardness after heat treatment at- I T 1 I a 145 1,55 16 0 1 1 700 1,750 I n n F. T. F. .(2) (z) 164 167 179 187 j 205 202 I 1.75 1. 0 257 344 327 401 429 437 i 2. .5 1. 0 332 413 399 400 394 I 438 3.5 1.0 411 424 432 416 405 I 429 I 5.0 1.0 383 385 413 433 433 I -i4 6 I 1. .75 2. 0 387 502 151 481 173 499 2.5 2.0 376 468 427 .88 472 483 3. 5 2. 0 390 426 459 455 437 421 5. 0 2. 0 323 f 427 359 366 I 373 '1 380 1 Balance titanium. 2 Unalloyed.

From Table II above, it will be apparent that the present alloys respond to heat-treatment as evidenced by increasing hardness after treatment. From Table I, it will be further evident that these alloys possess desirable tensile properties and good hardness, together with adequate ductility to permit working. It is believed that these alloys will also prove useful in applications requiring corrosion-resistant properties and good high-temperature characteristics. New and useful alloys of titanium having been dis closed, it is desired to claim the invention set forth in the appended claims.

What is claimed is:

1. An alloy consisting essentially of from 1.0% to 5.0% manganese, from 1.0% to 2.0% iron, and the balance titanium, characterized by a 25% in excess of the tensile strength of unalloyed titanium, measured in the as-hot-rolled (at 1450 F.) condition.

2. An alloy consisting of from about 1.0% to about 5.0% manganese, from about 1.0% to about 2.0% iron, and the balance titanium.

CHARLES M. CRAIGHEAD.

References Cited in the file of this patent Journal of Metals, March 1950, page 526. 

1. AN ALLOY CONSISTING ESSENTIALLY OF FROM 1.0% TO 5.0% MANGANESE, FROM 1.0% TO 2.0% IRON, AND THE BALANCE TITANIUM, CHARACTERIZED BY A TENSILE STRENGTH OF AT LEAST ABOUT 25% IN EXCESS OF THE TENSILE STRENGTH OF UNALLOYED TITANIUM, MEASURED IN THE AS-HOT-ROLLED (AT 1450* F.) CONDITION. 